<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Application
 * @subpackage Resource
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Db.php 18951 2009-11-12 16:26:19Z alexander $
 */

/**
 * Resource for creating database adapter
 *
 * @uses       Zend_Application_Resource_ResourceAbstract
 * @category   Zend
 * @package    Zend_Application
 * @subpackage Resource
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Application_Resource_Db extends Zend_Application_Resource_ResourceAbstract
{
	/**
	 * Adapter to use
	 *
	 * @var string
	 */
	protected $_adapter = null;

	/**
	 * @var Zend_Db_Adapter_Interface
	 */
	protected $_db;

	/**
	 * Parameters to use
	 *
	 * @var array
	 */
	protected $_params = array();

	/**
	 * Wether to register the created adapter as default table adapter
	 *
	 * @var boolean
	 */
	protected $_isDefaultTableAdapter = true;

	/**
	 * Set the adapter
	 *
	 * @param  $adapter string
	 * @return Zend_Application_Resource_Db
	 */
	public function setAdapter($adapter)
	{
		$this->_adapter = $adapter;
		return $this;
	}

	/**
	 * Adapter type to use
	 *
	 * @return string
	 */
	public function getAdapter()
	{
		return $this->_adapter;
	}

	/**
	 * Set the adapter params
	 *
	 * @param  $adapter string
	 * @return Zend_Application_Resource_Db
	 */
	public function setParams(array $params)
	{
		$this->_params = $params;
		return $this;
	}

	/**
	 * Adapter parameters
	 *
	 * @return array
	 */
	public function getParams()
	{
		return $this->_params;
	}

	/**
	 * Set whether to use this as default table adapter
	 *
	 * @param  boolean $defaultTableAdapter
	 * @return Zend_Application_Resource_Db
	 */
	public function setIsDefaultTableAdapter($isDefaultTableAdapter)
	{
		$this->_isDefaultTableAdapter = $isDefaultTableAdapter;
		return $this;
	}

	/**
	 * Is this adapter the default table adapter?
	 *
	 * @return void
	 */
	public function isDefaultTableAdapter()
	{
		return $this->_isDefaultTableAdapter;
	}

	/**
	 * Retrieve initialized DB connection
	 *
	 * @return null|Zend_Db_Adapter_Interface
	 */
	public function getDbAdapter()
	{
		if ((null === $this->_db)
		&& (null !== ($adapter = $this->getAdapter()))
		) {
			$this->_db = Zend_Db::factory($adapter, $this->getParams());
		}
		return $this->_db;
	}

	/**
	 * Defined by Zend_Application_Resource_Resource
	 *
	 * @return Zend_Db_Adapter_Abstract|null
	 */
	public function init()
	{
		if (null !== ($db = $this->getDbAdapter())) {
			if ($this->isDefaultTableAdapter()) {
				Zend_Db_Table::setDefaultAdapter($db);
			}
			return $db;
		}
	}
}
